Native American leaders pressed members of Congress and federal education officials this week to provide relief from provisions of the No Child Left Behind Act that they see as obstacles to running the language-immersion schools they need to keep their languages from disappearing. As part of a two-day national summit here on revitalizing native languages, three founders of immersion schools that are teaching children Cherokee, Ojibwe, and Native Hawaiian contended that some No Child Left Behind provisions present huge hurdles for language-immersion programs or schools